{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["concept or principle", "material", "machine or equipment", "machanical property", "engineering feature"], "input": "Results show that the effectiveness of PWHT is best assessed on large weld mock-ups ."}
{"concept or principle": ["effectiveness", "PWHT"], "material": [], "machine or equipment": [], "machanical property": [], "engineering feature": ["weld"]}